1 files changed, 5 insertions, 0 deletions
diff --git a/test/ruby/test_range.rb b/test/ruby/test_range.rb
index 1f370cfaee..0eb25480be 100644
--- a/test/ruby/test_range.rb
+++ b/test/ruby/test_range.rb
@@ -2,6 +2,7 @@ require 'test/unit'
 require 'delegate'
 require 'timeout'
 require 'bigdecimal'
+require_relative 'envutil'
 
 class TestRange < Test::Unit::TestCase
   def test_range_string
@@ -535,4 +536,8 @@ class TestRange < Test::Unit::TestCase
 
     assert_raise(TypeError) { ("a".."z").bsearch {} }
   end
+
+  def test_bsearch_with_mathn
+    assert_in_out_err ['-r', 'mathn', '-e', 'puts (1..(1<<100)).bsearch{|x| raise "#{x} should be integer" unless x.integer?; x >= 42}'], "", ["42"], [], '[ruby-core:25740]'
+  end
 end